Reem Batteries & Power Appliances Co SAOC Page 1 of 6

Procedure for Handling, upkeeping Batteries on

Storage MF-01

MF Batteries 09.07.09

1.0 SCOPE

This procedure is applicable for transporting, receiving, storing, handling and maintaining FRESH MF batteries,

by distributors, dealers & retailers, in their respective warehouses and sales outlets.

2.0 OBJECTIVE

Since MF batteries are supplied in filled and charged condition

• Special care to be taken during transportation, so that there is no spillage of corrosive acid and

damages arising out of such incidents

• Batteries are received and stored in proper conditions, so that “charge status” is maintained and FIFO

(First IN, First Out) practiced for delivering batteries in best condition (full state of charge) to the

market and ultimate customer

• Self discharge is inevitable in wet batteries. The process is accelerated at higher ambient storage

conditions. Periodic charging program is proposed based on “charge status” of the battery measured

in terms of OCV (Open Circuit Voltage).

3.0 TRANSPORTATION OF MF BATTERIES

• Keep always the batteries in upright condition. Batteries kept in slanted / horizontal condition

would lead to acid spillage through vent holes, spoiling / eating the cartons and metallic parts around.

In worst conditions, it would lead to shorting of batteries, fire and explosion. (This holds good during

storage also)

• Do not transport single / individual MF batteries in the boot /pick ups / vans. This will lead to

jumping / falling of batteries leading to leakage. Under such situations, group 2 or 3 batteries together

(in the absence of wet batteries, it may be grouped with DC batteries) and stretch wrap them. This

would not allow batteries to jump and fall.

• Never keep more than 4 stacks high and one pallet over other. Since MF batteries are heavy with

acid, the bottom most layers will be damaged if you do so.

• Incase, if the situation calls for transporting batteries without cartons, make sure that terminals are

covered with caps and batteries are stacked one over other with proper Thermocole packing between

layers to protect terminals.

4.0 RECEIVING & STORING :

• At the time of receipt, check for any leakage & wet

cartons – Segregate those batteries and report such

incidents to Reem.

• Check OCV of few batteries picked up from different

pallets on receipt and maintain record. Please inform

Reem, if received below 12.50V

• Cartons are stamped with alphabets which denote the

month of charging. (A-Jan, B-Feb,….H-Aug, J-Sep, K-Oct,

L-Nov, M-Dec).

• Unload the pallets and arrange them based on charging

month codes. Follow FIFO in maintaining the stocks. Do

not mix up Old & New stocks.

Pallet location

reference

Reem Batteries & Power Appliances Co SAOC Page 2 of 6

• For identification purposes, put up a display board indicating First Charge (FC) month code, Next

Due (ND) month for recharging and Recharge month

Code (RC) if recharged

• Pallet location inside the warehouse may be noted and

FIFO/RECHARGE monitoring register shall be opened

for effective implementation of FIFO and monitoring

recharging schedules as per Annexure-1

How to maintain FIFO Monitoring Register :

• Please have a look on the format given in Annexure-1

• Open separate pages for different type of batteries as per

the format

• Note down invoice, date of receipt etc.,

• Allocate an ID for the pallet and keep it in the warehouse with location marked. Identify the pallet ,

Location and the quantity in the register.

• Cartons in the pallet carry charging month code which is abbreviated in cl.4. Log these details in the

register

• Check the voltage of atleast 5 batteries from the pallet and record the average OCV.

• Keep entering the closing stock every month.

• Once in 3 months, check the OCV of atleast 5 batteries from the pallet and record the average in the

register.

• If OCV is < 12.40V, batteries are not fit for sales and can’t be stored further in that condition. It

is recommended to put the batteries for recharging as per the recommended procedure outlined at the

end of this note.

• Keep maintaining this record till the pallet gets completely exhausted

How to maintain Issue Record :

• An issue register shall be maintained as per Annexure-2 for further strengthening FIFO system

• Hereagain, separate pages allocated for different types of batteries

• Palletwise, locationwise opening stock is entered.

• During every issue, the date, quantity, average OCV of 5 batteries and closing stock details are

logged in the format

• Issue entry is continued till the pallet quantity gets completely exhausted.

• This way it helps to draw batteries from the left out pallets and not from fresh pallets

OTHER POINTS

• Never store / keep the batteries directly under Sun light Or near to heat sources. This will bring

down the “charge level” of the batteries very quickly. Always store the batteries in cool & dry places

• Store the batteries in upright condition

• Never store more than 4 stacks high and one pallet over other

• Since there is evolution of Hydrogen and Oxygen inside the storage area, Never store the batteries in

airtight locations. Store the batteries in well ventilated areas

5.0 HANDLING & SAFETY

• Lift MF batteries carefully as they are heavy and in upright condition all the time while handling

• Do not drop or throw the batteries while handling.

• Do not smoke inside battery storage area.

• Never do welding jobs and avoid sparks and flames near MF storage and especially charging

areas

• Be careful while using metal objects near the battery. Accidental shorting of the terminals would

result in explosion and personal injuries.

Charge status

display board

Reem Batteries & Power Appliances Co SAOC Page 3 of 6

6.0 MAINTAINING FITNESS OF BATTERIES

• On storage, batteries undergo self discharge which is accelerated by higher ambient storage conditions.

The “charge level” of the battery decreases gradually. The “charge level” of the battery can be

recognized by measuring Open Circuit Voltage (OCV) of the battery

• Batteries can’t be sold if OCV is < 12.40V.

• Below 12.40V, batteries may pose vehicle cranking problems and yield poor service life depending on

vehicle condition and driving pattern.

• Also, if batteries are allowed to go down below this voltage, further drop in voltage and loss in “charge

level” will be very quick.

• Keeping batteries at low “charge level” Or “ in Discharged condition” for longer period would lead to

Sulphation , cracking of grids & snapping of welds etc.,. Such batteries can’t be revived by charging .

They need to be scrapped.

• Hence, it is important that FIFO is followed and periodical maintenance charge is given if voltage goes

below 12.40V, for the old stock.

• Under Gulf climatic conditions, it is recommended to recharge MF batteries once in 6 months or

when OCV comes to 12.40V whichever comes earlier.

7.0 RECHARGING OF STOCK BATTERIES.

Be careful while using metal objects for connecting / disconnecting batteries during charging.

Accidental shorting of the terminals would result in explosion and personal injuries.

A. CONSTANT VOLTAGE CHARGING :

• Constant voltage charging is recommended for all MF batteries to avoid overcharging and loss of

electrolyte which reduces the life of MF batteries.

OCV

Check

OCV

>12.4

OCV

<12.4

Always sell the oldest

batteries first. If oldest

batteries are kept at

the front of your stock

selling them is easy

STOCK (FIFO)

CHECK VOLTAGE

BEFORE SELLING

OCV

>12.4 SALES

Check OCV once

in 3 months

STATE OF

CHARGE

WET BATTERIES

Always store in a

cool, dry place

STORAGE

NOTE : Charging voltage, current, duration and no of

batteries to be connected- Refer cl.7 and the table

CHARGING

CONSTANT CURRENT CONSTANT VOLTAGE

CV CHARGER

14.4V/Battery

15A max

CC CHARGER

Current Time No of

btys 0

2

46 8 10

12

1416

0

2

46 8 10

12

1416

0

2

46 8 10

12

1416

Reem Batteries & Power Appliances Co SAOC Page 4 of 6

• If the charger allows setting number of batteries using a knob, connect that many number of

batteries in the circuit in series. The current setting in the charger can be at the maximum 15A

• If the charger allows voltage setting ( and not the number setting knob) , then divide the rated rectifier

DC voltage by 14.4. For eg., if 225V is the rating of the rectifier, then 225/14.4 = 15.6. Connect 15

batteries in series and set 15 X 14.4V/btry = 216V in the rectifier using voltage setting knob.

• NEVER CONNECT DIFFERENT TYPES OF BATTERIES IN SERIES FOR CHARGING

• NEVER CONNECT FRESH & OLD BATTERIES IN SERIES FOR CHARGING.

• CONNECT BATTERIES OF SAME TYPE from SAME PALLET /BATCH Or group them according

to their voltage range of +/- 0.05V (eg., 12.11~12.20V, 12.21 ~ 12.30V……) FOR CHARGING.

• End of charging : Initially batteries may take full current and once it reaches 14.4V/battery, current

tapers down to 0 Amps. This is an indication that batteries reached full charging

B. CONSTANT CURRENT CHARGING :

• Check the rated output DC voltage (Voltage rating) of the rectifier .

• Divide the output voltage by 15V and round it off to the lowest whole number. For eg., 250V is the

rated voltage of the rectifier. Then 250/15 = 16.6. That means , you can connect 16 batteries in series.

• NEVER CONNECT DIFFERENT TYPES OF BATTERIES IN SERIES FOR CHARGING

• NEVER CONNECT FRESH & OLD BATTERIES IN SERIES FOR CHARGING.

• CONNECT BATTERIES OF SAME TYPE from SAME PALLET /BATCH Or group them according

to OCV range of 100mV (eg., 12.11~12.20V, 12.21 ~ 12.30V……) FOR CHARGING.

FAILURE TO ADHERING TO THE ABOVE INSTRUCTIONS WOULD LEAD TO BOILING OF

ELECTROLYTE AND SOMETIMES EXPLOSION OF BATTERIES.

After completion of recharging, repack the batteries inside the cartons and put a sticker on the pallet indicating

the last date of recharging

Constant Current Charging Details :

OCV

Ap

pro

xim

ate

SO

C

CHARGING CURRENT FOR BATTERY TYPES

Ch

arg

ing

Du

rati

on

, H

rs

Ns40 ~

Ns40Z

N50 N50Z,

55D23

Ns70,

75D26,

80D26,

N70

N70Z,

90D31

55530/59

55548/65

56618 58815 60038

78-72

74-60

34-60

12.40 ~ 12.49 61 ~ 75%

4A 5A 6A 7A 8A 9A 10A

3

12.30 ~ 12.39 46 ~ 60% 5

12.20 ~ 12.29 31 ~ 45% 7

12.10 ~ 12.19 16 ~ 30% 8

12.00 ~ 12.09 0 ~ 15% 10

< 11.99 0% 13

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